Antiskid tire-tread.



J. H. THHELKELD.

ANTISKID TIRE TREAD.

APPLICATION FILED AUGM. 1915.

1 1 9&3 11 Q, 7 Patented Aug. 29, 1916.

inseam.

John H. rm'nnnnrin, or enanr'ronyrowa.

.nnrrsmn rant-annals.

To all whomz't may concern Be-it known that I, JOHN H. THRELKL D,

a. citizen'pf the United States of America,; and a resident of Chariton, county of Lucas,

State of Iowa, have invented certain new armor and anti-slip to respectively prevent the puncturing-and slipping of the tire on the roadway.

Une of the particular objects" of this vention is to provide a metal tread which is formed with casing-plate sections having an 'nnderlying rib and connecting said sections in a'mann'er which will avoid a hinge movement at the juncture or adjacent-- edges of the ..casing-plates and providing 'substan.

'tially a rigid metal support outside of said adjacent edges. q 4 7 Another object is to provideselt-locking connections'betweenthesections,--so that by opening a single joint between'any two ot the sections, the-treadcan be removed from thetire. I v 7 These and other" objects are att'ained'by drawing, in whic h j- -Figure 1 is a side'elevation of anLautom the means illustrated in the -accon 1panying.

bile wheelishowing the improved tread applied around theperiphery of the tire; Fig.

2 is an enlargedlongitudinal sectional view. of a portion ofthe improved tread; Fig. 3 is a JYOSS'rSQCblOD. on the line 3--3 of Fig. 2;

Fig. 4 is a perspective view of one of the tread sections looking down on the tread surface thereof; Fig. 5is an enlarged detail sectional view showing the manner of con necting the sections of the tread together; Fig. 6 is a plan view of one of the connections between the .separate sections of thetread; Fig. 7 is a similar View to Fig. 4 showing a modified form of tread which is especially adapted for use on the rear or traction wheels. of the vehicle; and Fig. 8 is-a perspective iew of a modified form of locking pin;

Similar reference numerals in all of" the figures of the drawing designate like parts.

Broadly, the tread is formed of a pinrality of sections connected together, with ti t each section embodying a casing-plate 10 of any suitable non-puncturable material, and

' weciiication of letters Patent.

. plate.

; a metaltread-rib 1 1' formed integral'withjor secured to the outsidethereof by rivets or;

erably shaped in cross-section to torni'inv clmed sides, is relatively. narrow compared.

.to the width of the casing-plate,- and extends" longitudinally and centrallyof saidflcajsing i As shown clearly in Fig.4 of the. drawing, 'one end12 of the rib projects be;:

yond the corresponding edge of the casing in any suitable manner. This rib-isgpretf plate-audits oppositefend 3.3,termina'tes short of. the opposite edge of the ca singplate a distance equal to the projectingend as cured together, the jointsbetween said c'as so that, when two or more sections a re ..se-"

ing-plates and said ribs will be staggered relatively toeachtonner, as clearly shown in. Figsl and-2 of tire drawing.

. The casing plates. 10 are preferably formed of thin sheet-metal,- are bent transversely to conform to the periphery of the tire-casing inane are also bent longitudina'lly or shaped to curve .around the treadot the tire-casing and extend-somewhat on the,

sides thereof; Both end sflfl and .13 of the tread-ribs of each section are preferably ibeveled or inclined in the same direction,

- to provideinclined faces 15 and 16, which are adapted, to. contact with corresponding.

inclined faces on the ribs of the adj acent sections, so that the joints formed between the ribs of adjacent. sections areinclined to the periphery of the tire. Both ends of the tread-ribs are also cut away or recessed to provide parallel vertical sides 17; to' form fiat connecting surfaces for the reception ofthe connecting links 18, which connect the beveled ends of adjacent ribs together to form a continuous metal tread; These links 18 can be secured to the ends of the ribsby bolts or rivets, but it is desirable to "construct one end so that it will be detachable, asclearly shown in Fig. 5. ()ne end of each of said links is pivotally attached by a rivet 19 to the projecting end 12 of the rib oi one section, and is provided with a slot 20 in its opposite end which is adapted to engage the end of a pin 21 fixed in the end of the rib on the adjacent section.

ted ends of the links with the pins it is necessary to turn'the links at right angles to the ribs before the slots will pass over The pins 21 have their: ends bent angularly toward the tiretit lid

the bent ends or heads of said pins 21; then after the engagement the links can be turned in alinement with the ribs, which will automatically lock them in position and hold them. locked until moved again to a vertical position;

The -forinof the sections thus far described having only a longitudinal rib) is more particularly adapted for the front wheels of aniotor vehicle, but for the rear or traction wheels the form shown in Fig. 7 is'used. In this rear-wheel form, the identical structure of the front wheel sections is used together with transverse metal ribs 22, the same being of like form in cross-section as] the longitudinal ribs and-are preferably of less height than said longitudinal ribs where they are connected thereto. transverse ribs are substantially similar in shape to th'e longitudinal ribs to provide" road-engaging edges which lie in a plane" parallel with the axis of the vehicle axle,

and they'can. be formed either integrally with the longitudinal ribs or separately andsecured to said longitudinal ribs and casingplates by rivets brother-wise.

As before mentioned, the casing-plates 10 are preferably formed of thin sheetmetal, making them sutticiently resilient at their sides to give and bena withthe tire-casing when it is depressed, and, to'preyent cutting of the tire-casing, the longitudinal edges of the plates are curved or rolled as shown at 23. Each of the casing. plates is provided with strap-apertures Q-ladj acent, their longitudinal edges and preferably back of the rolls or beads formed on the edges. These aper lllIIQS-EIIQ adapted'to receive securing straps which engage around the tire and rim of the wheel to "retain the metal tread in position.-

In operation, the. length of the sections is proportioned to the circumference of the tire-casing they are intended. for. I prefer These Lit-76,31

'vided-i which li as a road-engaging tread-ring that cannot be broken upwardly to any appreciable extent atits joints when engaged around a tire. This is secured by providing the ribs with the relatively wide casingplates and: fixing them to the ribs in a manner to stagger the joints of the plates and ribs and also. bcveling or overlapping the. adjacent ends of the ribs or, in other words, connecting the ends of the ribs together intermediate the ends of the casing-plates. It will be understood that the slight movement-atthe joints is obtained by the lost motion. at the. pivotal connections together with. the resiliency oi the casing-plates, thereby allowing the tread to give with the cushioning member so that it can perform its function.

This improved metal tread is especially adapted for use in mud, snow, or ice, and will effectually prevent skidding and slipping oi the .wheels, and, being constructed in sections, it is easily manufactured at a low cost, and, as the sections become worn or broken, they can be readily replaced with out the use of special tools.

The modified form of pin 21 shown in Fig 8, is provided with elon ated heads 21 a at each end extending on both sides of the pin, instead of the single hooks shown in. the remaining figures. It will also be understood that thc rolled edges 23 of the plates (for preventing the cutting of the tires) can also be omitted without detracting from the successful operation of the device. Having thus described my invention, what I claim is:

A metal tire tread for vehicles, comprising a plurality of independent sections connected together, each section embodying a casing-plate provided with a longitudinal tread rib having one end projecting beyond one edge-of said plate and its opposite end terminating. short of the opposite edge of said plate, the end faces ot said rib being inclined to their periphery to form overlapping joints with adjacent ribs, and means for securing the ends of ad acent tread rib sections together.

In testimonywhereof I hereunto allix my signature. 7

JOHN H. THRELKELD. ll itnesses J D. rHltELKELD, S. A. THRELKELD. 

